What should we do with hair collected and tied by a former maid?

We do not understand the issue of the knots mentioned, but if they are like the knots of sorcerers into which they blow, and there is doubt that sorcery has occurred in them, then they must be destroyed by untying them while reciting Quranic verses over them, such as Ayat al-Kursy and the Mu'awwidhat, and then destroying the hair. It is better to investigate to confirm the matter, and to frequently seek refuge (with Allah) and ask for well-being.